Describe briefly the functions of the three segments of n-p-n transistor.

Explanation

### Step-by-Step Text Solution

1. **Understanding the NPN Transistor Structure**:
An NPN transistor consists of three distinct segments: the emitter, the base, and the collector. Each segment has a specific function and is doped differently.

2. **Emitter Segment**:
- The emitter is the leftmost segment of the NPN transistor.
- It is heavily doped with n-type material, which means it has a high concentration of electrons (majority carriers).
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